Hello, I have played with all 4 of these rackets, with HS-Plus currently as my most favorite racket, I would like to share my personal comparison between them.
Stiffness: HS-Plus > 100X Ultra = TKF Ultra > Fantome. However I would consider the Fantome a pretty stiff racket too.
Balance point: Fantome > 100X Ultra = HS-Plus = TKF Ultra. Fantome has a very high balance point, the other 3 are more or less the same, as Victor rackets always seem to have large variations in specs between those of the same model.
Clear: they all do very well, there is no significant difference between them, but if I have to rank them then 100X Ultra > HS-Plus > TKF Ultra = Fantome
Drive: HS-Plus is the most stable and has the most weight behind its drives. Fantome has the fastest swing. 100X Ultra and TKF Ultra have very nice drives too. Overall I would rank HS-Plus > 100X Ultra = TKF Ultra > Fantome
Smash: HS-Plus > 100X Ultra > Fantome = TKF Ultra. This is the area that I’m most certain about.
Control: HS-Plus > TKF Ultra > 100X Ultra = Fantome. The combination of super light weight + super high balance point gives me accuracy troubles with Fantome.
Defense: HS-Plus and Fantome excel at this area in their own way. HS-Plus’ super stiff shaft + compact frame makes returning shot an intimidating attack on its own, if your strength and skill are up for it. Fantome is so fast, it would give a boost in reflex I feel. 100X Ultra and TKF Ultra are decent enough.
Overall for me HS-Plus is a near perfect racket: formidable smashes, super stable drives and superb control. 100X Ultra is perhaps the most “fun” racket of the 4, being able to dish out super steep smashes and drives while also is decent enough at other areas. TKF U too is decent in all area but is a bit boring, similar to Astrox 77 Pro, another racket that is decent to great everywhere but excels at nothing (No, TKF Ultra doesn’t play similarly to 77 Pro, I’m just using 77 Pro as an example of a great all around but boring racket from Yonex). Fantome is also a super fun racket to play with, blazing speed with superb mid to front court smashes.
I own 4 HS-Plus including a 3U, 4 Fantome including a 3U, 3 100X Ultra including a 3U, and 2 TKF U both 4U. Been playing with them since the release. Hope my input helps.